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Just bonding edge to edge would likely not be the most secure method
Some options include:
Design both moulds so that they deliver two symmetrical halves, then look to bond some carbon strips on the inner surface of one side, allowing an overlap that you can use to bond the other side to
or: make one side a cm or so wider than necessary. You can then look to use 1mm sheet wax (if 1mm is your target thickness) to create a temporary 'joggle' around the excess perimeter length of the mould. This creates a step in the part when de-moulded that would work in much the same way as the first option, but would be integral to the part itself and likely be more straightforward to bond to. A bit of careful measuring and planning required, but it can work really well if not needing to make loads of copies. The sheet wax would stick to the part, but it's not too difficult to scrape away afterwards
You might want to build-in that stepped edge to the mould itself, but that could give rise to issues with the stepped return causing a mechanical lock dependent upon the mould design, so a temporary solution using wax might work out better?
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